Blade-grinding device



W. C. DELZELL.

BLADE GRINDING DEVICE.

APPLICATION FILED IuLY II. I92I.

1,438,098, 1 Patented Dec.5,1922.

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f iran s i WALTER C. DELZELL, OF LOS ANGELES, CALIFORNIA.

BLDE-GRINDING DEVICE.

Application led July 11,

To all whom t may omwem:

Be it known that I, WALTER C. DELZELL, a citizen of the United States, residing at Los Angeles, in the county of Los Angeles and State of Californiahave invented certain new and useful Improvements in Blade- Grinding Devices; and I do declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

My invention relates to -improvements in blade sharpening devices and more particularly to those employing a roller provided with a helical grinding surface, two rollers disposed side by side so that the grinding ri s of one roller are received between the ribs of the other roller. l

The object of the present invention is to provide novel means whereby the grindingv ribs may be moulded in retaining grooves in the rollers and effectively keyed therein.

With the foregoing in view, the invention resides in the novel features hereinafter described and claimed, the descriptive matter being supplemented by the accompanying drawings.

Figure 1 is a top plan view showing two rollers constructed in accordance with my invention mounted in a conventional frame.

Figure 2 is a horizontal sectional view.

Figure 3 is a vertical transverse sectional view as indicated by line 3 3 of Fig. 1.

Figure 4 is an elevation of one of the rollers before the grinding rib is moulded.

Figure 5 isa longitudinal sectional view as indicated by line 5-5 of Fig. 6.

Figure 6 is a transverse sectional view as indicated by line 6-6 of Fig. 4.

Figure 7 is an elevation showing a diEerent form of construction.

In the drawings above briefiy described, I have illustrated two of the improved rollers operatively associated with each. other, but since the construction of both rollers is the same, only one will be described. The numeral 1 designates a roller formed of wood or any other appropriate material and here shown mounted on a mandrel 2 having trunnions 3 rotatably supported byv any appropriate form of frame 4. The periphery of the roller 1 is formed with one or more grooves 5 which preferably extend helically as shown. At circumferentially spaced 1921'. serial iro. 458,924.

points, the grooves 5 are intersected by openings 6 which are drilled lon itudinally through the roller and may eit er extend from end to end of'the latter as seen in Figs.4 1 to 6, or may extend inwardly from both ends as illustrated in Fig. 7 The openings 6 are by preference so located that they extend across the bottoms of the grooves 5 and form grooves 6*". l

A plastic abrasive materiaL is moulded in the grooves 5 and extends beyond the periphery of the roller to form a helical grinding rib. When this material is moulded in the grooves, it runs into the openings 6 and thereby forms keys 8 integral with the grinding ribs, said keys serving to e'ectively secure the ribs in t e grooves 5 and acting also yto prevent any possible circumferential creeping of the ribs in the grooves. As indicated in Fig. 2, the keys 8 of adjacent groove portions will integrally join each other in some instances, while in others, the'keys will extend an insufficient distance from the r'bs to permit their uniting. In either case, the desired results are obtained.

After the moulding operation has been completed and the plastic abrasive has set suiiiciently, the ribs are smoothed and trued in any suitable way.

While one of the rollers might be advantageous for certain uses, I prefer to associate two of them in the manner shown in the drawings, the ribs of one roller bein received between the ribs of the other. 'I us, when one roller is rotated by means of a crank or the like 9, it will turn the other roller, as if the two were geared together. When the association of rollers herein shown is employed, a sharp edge may be quickly placed on a knife or other blade by properly rotating the rollers and holding the blade in the angle between them. It is not necessary to longitudinally shift the blade since the grinding ribs extend helically and thus each rib acts on said blade from one end to the other.

From the foregoing taken in connection with the accompanying drawings, it will be seen that I have produced a novel device for carrying out the objects of the invention in an expeditious manner. The details disclosed are preferably followed but within the scope of the invention' as claimed, numeitous minor changes may of course be ma e. l

Q mesme l claim: Y

1. A grinding device comprising a roller having a peripheral channel and circumferentially spaced openings communicating with said channel and extending across the bottom of the latter in the form of transverse grooves,.and an abrasive plastic moulded in said channel and grooves and having integral laterally extending keys moulded in said openings.

2. A grinding device comprising aroller having in its periphery a helical groove, said roller having circumferentially spaced openings each communicating with a plurality of convolutions of said groove, and an abrasive,-

plastic moulded in said groove and having integral keys moulded in said openings.

3. A grinding device comprising a roller peripherally grooved and having spaced groove portions extending around its periphery, said roller also having circumferentially spaced openings drilled parallel With its axis and intersecting said rooves, and an abrasive plastic moulded 1n said groove portions and having integral keys moulded in said openings.

In testimony whereof I have hereunto'set my hand.

WALTER C. DELZELL. 

